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Stability of Small-Gain Closed-Loop System and Its Applications in VSC-Based DC/AC Power Systems.
- Source :
-
Electric Power Components & Systems . 2019, Vol. 47 Issue 18, p1610-1622. 13p. - Publication Year :
- 2019
-
Abstract
- In a VSC-based HVDC/AC power system, dynamic interactions introduced by the HVDC system are usually weak. Hence, the small-signal stability of the HVDC/AC system is not affected significantly by the HVDC system. This paper presents a description of a weakly coupled VSC-based HVDC/AC power system by a small-gain closed-loop model that consists of two open-loop subsystems interconnected by a small gain. A special condition of open-loop modal proximity of the HVDC/AC system is examined, i.e., in the small-gain closed-loop model, an oscillation mode of one open-loop subsystem is close to an oscillation mode of the other open-loop subsystem on the complex plane. Our analysis indicates that when the open-loop modal proximity occurs, the corresponding closed-loop oscillation modes repulse each other. The closed-loop modal repulsion results in strong dynamic interconnection of the open-loop subsystems, thereby degrading the closed-loop system stability. Two examples are presented to demonstrate the applications of the proposed small-gain closed-loop model. Finally, the utility and accuracy of the closed-loop modal repulsion are evaluated from the viewpoint of the stability of HVDC/AC power systems. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 15325008
- Volume :
- 47
- Issue :
- 18
- Database :
- Academic Search Index
- Journal :
- Electric Power Components & Systems
- Publication Type :
- Academic Journal
- Accession number :
- 142124719
- Full Text :
- https://doi.org/10.1080/15325008.2019.1689455